Meanings
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1
adj
having a rather stout or heavy body, especially in a dignified-looking way
A portly gentleman in a dark waistcoat greeted them at the door.
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2
adj
having an imposing or dignified bearing; stately, in older use
The ambassador entered with a portly manner suited to the formal occasion.
Thesaurus
Etymology
From the older noun port ("bearing, carriage, or manner of carrying oneself") + -ly. Port came through Old French from Latin portare ("to carry"). The original sense was dignified or stately in appearance; association with a substantial physique produced the modern euphemistic sense "rather fat."